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Há 1 dia · Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues [12] and organs. [13] Some of them are radially symmetrical, but most are asymmetrical.
Há 3 horas · The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs . Eon.
Há 1 dia · 真核（eukaryote）という用語は、ギリシャ語のεὖ（eu、よい、うまい）とκάρυον（karyon、仁、核）からその名前がつけられた 。真核細胞には、細胞小器官と呼ばれるさまざまな内膜結合構造と、細胞の組織と形状を規定する細胞骨格がある。
